Creating a GridFS media server on Heroku

If you want to serve images stored in GridFS, you can use the rack-gridfs:

require 'rubygems'
require 'sinatra'
require 'rack/gridfs'

class MediaApp < Sinatra::Base
 configure do
 db = 'mydatabasenameinlocalhost'

 uri = nil
 if ENV['MONGOHQ_URL']
 uri = URI.parse(ENV['MONGOHQ_URL'])
 puts "URL : >>> #{uri}"
 MongoMapper.connection = Mongo::Connection.from_uri(ENV['MONGOHQ_URL'])
 db = uri.path.gsub(/^\//, '')
 end
 if production?
 use Rack::GridFS, :database => db, :hostname => uri.host, :password => uri.password, :port => uri.port, :username => uri.user, :prefix => 'images'
 else
 use Rack::GridFS, :database => db, :prefix => 'images'
 end
 end

 get /.*/ do
 "The URL did not match a file in GridFS."
 end
end